Stop disabling force_compositing_mode for background RenderViews.

content/public/browser/web_contents_delegate.h

Index: content/public/browser/web_contents_delegate.h
diff --git a/content/public/browser/web_contents_delegate.h b/content/public/browser/web_contents_delegate.h
index b869a52af7f64752cdecf2221e02ada453e3e4f8..02103142bfdde4adbc7dd25ed9ebd256918121d9 100644
--- a/content/public/browser/web_contents_delegate.h
+++ b/content/public/browser/web_contents_delegate.h
@@ -461,6 +461,9 @@ class CONTENT_EXPORT WebContentsDelegate {
   virtual void MoveValidationMessage(WebContents* web_contents,
                                      const gfx::Rect& anchor_in_root_view) {}
 
+  // Returns true if the WebContents is never visible.
+  virtual bool IsNeverVisible(WebContents* web_contents);
+
  protected:
   virtual ~WebContentsDelegate();